Carbureter



c. P. BUHL.

'CARBURETER.

I APPLICATION FILED IAN- 24,1920.

1,397,500) Patented Nov. 22, 1921.

ATTORNEY lever 11.

GAY P. BUHL, 0F PASS'AIC, NEW JERSEY.

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Specification of Letters Patent.

Application filed January 24, 1920. Serial No. 353,715.

Be it known that I, GAY P. BUHL, a citizen of the United States,residing. at Passaic, in the county of Passaic and State of New Jersey,have invented certain new and useful Improvements in Carbureters, ofwhich the following isa specification.

This invention relates to carbureters for internal combustion engines,and it consists in a novel combinationof parts in that class ofcarbureters wherein relative movement is provided for as between themembers forming the delivery nozzle and venturi throat, the inventionhaving in view to increase the efficiency of such carbureters and torender them more compact and adapted to have the movement of the one ofsaid members that is shiftable capable of being effected with greaterease and with the use of mmpler instrumentalities than heretofore.

In the accompanying drawing,

Figure 1 is a side elevation of the carbureter, with the cover and thenearer sections of the throttle and throat members removed;

Fig. 2 is a vertical sectional view thereof;

Fig. 3 is a plan;

Fig. 4 is an elevation of the throttle device and certain accessories,shown partly in section;

Fig. 5 is a side elevation of said device; and

Figs. 6 and 7 are opposite elevations of the throat member.

The substantially cylindrical casing 1, provided at one side with aremovable cover 2, has opposite radial openings 3 and 4 forming its airintake and outlet, respect vely; and it also has an opening 5 in wh chis suitably secured, largely housed within the casing, the float chamber6 to which the liquid fuel is admitted by the inlet 7 and from which itis delivered by the tubular projection or pipe 8 reaching across themlxing passage 1 of easing 1, said float chamber containing anywell-known constant-levelmaintaining means, as float 9 and valve 10 forinlet 7 connected with said float by the Pipe 8, which is arrangedhorizontally (the installed position of the carburetor being such thatoutlet 4 will be at the top),

16, the margin of said member being beveled i underneath and at theoutsideto form an exterior marginal surface parallel with thesurrounding inner marginal conical surface of lip 13. ofthe type whichdelivers fluid in a hollow cone, and the continuous conical outletthere- Parts 12 and 14 form a nozzle.

Patented Not/.22, 1321..

of formed by the aforesaid opposed marginal conical surfaces of saidparts may be varied by turning screw 17 tapped in member 14 and havingits head projecting down through and obtaining an exterior bearing onpipe 8, member 14 being upheld by a spring 18 and guided vertically byhaving its boss16 telescoped with the tubular portion 19 of part 12,which has fluid passages at 19. Access may be had to screw 17, foradjusting it, through a hole in the casing normally closed byascrew-plug 17 (Fig.2).

The exterior form of the nozzle is substantially ovoid with the morerounded end downward, the upper or-less rounded end being preferablyreduced to a point; and preferably the fluid outlet of the nozzlesubstantially coincident with its maximum transverse diameter, as shown.

There is a manually shiftable control memher which includes a throttleand a'throat-' forming device. The throttle device shown is of thedouble-throttle type and comprises two flat slde walls 21 joined byvalves or throttles proper 22, 23, which form opposite segments of thesame cylinder, and a radial:

wall or baflle-24 extending to the rearward edge of throttle proper.23.. Ahub 25 projects outwardly from one wall '21, and a shaft 26,penetrating this hub and the other wall 21, projects outwardlyfrom thelatter wall. The hub and the relatively opposite end of the shaft, bothof which thus project from the walls 21, are journaled in hubs 2 formedon the cover 2 and the opposite wall of the casing (the latter wallbeing omitted in Fig. 4). The throttle device and shaft normally rotateas one, though the former is adjustable relatively to the latter, aswill appear. The throat-forming device is a sector-shaped block 27having formed therethrough from one radial face to the other a throat 27which is tapered and is further curved around shaft 26; said device ispinned on the shaft, being arranged between the walls 21 of the throttledevice with the larger end of its throat downward as the parts are seenin Fig. 2. The purpose of the relative adjustment, rotatively, of theshaft and throttle deviceisto alter, rotatively, the positions or" thethrottle and throat-forming devices relatlvely to each other. For eliecting this adjustment (while normally pre-- serving the parts fixed withreference to each other) aworm-wheel 28 is fixed on the hub '25 and a'yoke 31 is' fixed on the shaft, the

yoke having journ'a led therein a worm:'29 engaging the worm-wheel andequipped with a milled nut '30 for turning it. The control againstthelefthand section of the throttle device. Having introduced the shaftthrough this section, then through the throat member, and then-throughthe other section "of the throttle device, and having pinned the throatmemberto the shaft, these parts journaled in cover-hub 2;

worm-wheel and yoke 31 are fixed on the are introduced into casing 1 sothat said end of the shaft is journaled in casing hub 2". Then the cover2 is applied, leaving hub 25 Finally the hub 25 and shaft 26,respectively; There is a pin 23 onthefleft-hand section 23 engag- 'ingasuitableholenot shown-An the other section to lock the former-to thelatter for rotation therewith, The curved outer jsurfacesofthe valves orthrottles proper 22, 23 and the throat-forming devicebear face tofacea'gainst the inner surfaceof the cylindrical wall of the-casing; I i7 hen the throttledevice is inthe position shown in Figl itfullycloses'the intake '3; but at that timea notch 32 in throttle proper 23permits the engine suction to produce a throat.

copious flow at the nozzle, atmospheric air being then admitted .tochamber 6'through an orifice 33 (Fig. 2).

The members 121& and 27 together pro duce a throat forming means inwhich one is movable lengthwise of the axis of the throat to vary thevolume o'ffiuid adapted to pass therethrough,"due'to the taper of the Ihave obtained compactness of structure, facility of movement of themoving part and simplicity ofthe instrumentalities for actuating saidpart because the movement is pivotal rather than rectilineal.

ing through the throat is reduced because the nozzle is substantiallyovoid in form and ward the outlet of the "throat, and notwithstandingthe curvature ofthe throat such nozzle makes the throat one of theventuri iNoise and undue turbulence of the air'pass has itssmaller'endprojectingrelatively toclass and on account of its peculiarform;

taken with the curvature of the throat, causes the zone of greatestrestriction ofthe venturi to be disposed desirably above the annularfuel: outlet of-the nozzle: this zone of greatest restrictionotthe'venturi, it will be seen, is substantially contiguous to theinclined plane represented'by the upper face of the member 27 in theposition of said member illustrated in Fig. 1.

Having thus fully described my inventlon, what I claim as'n'ew anddeslreto secure by Letters Patent 1s-:- A I A carbureter venturi meansincluding a throat-forming member, and a substantially ovoid air-flowobstructing memberarranged 1n the throat of the'fi'rst member and spacedtherefrom, oneof sa d members being-shiftable'relatively to the other ina path curved around an axis transverse to and exterior of the throatand the throat being tapered and, curved around said axis, theobstructmg member having its smaller end projecting,

toward the-smaller end of the throat.

In testimony whereof'l' affix my signatureg

